With the exception of the ATT the only performance mod is the exhaust. First day hauling hay I was trying to get as many loads as possible hauled so I didn't have time to hook up the scanner for any. I'd estimate most loads were in the 500-1000 lbs of junk in the truck with 4 bales on the trailer est 7000 lbs. Number of times I hit 12psi boost. EGT hit 1050 a couple times engine temps never got over 195. Had one load that I really would have liked to scan. Got home with only 3 bales and didn't know where the 4th was. Sent brother to find bale while I waited to know if I needed to load tractor. Tractor is 5000+ base weight, rear tires are ballasted to the brim, plus loader and 6' tiller trailer weight 2-3000 pulled along pretty good even with the weight of 1 bale added to the tractor. Hit 245 IAT one time on this run. Speeds on all the runs were in the 55-65 range. Averaged around 12.5mpg.
Acceleration is definately better with the ATT. Didn't have IAT pre ATT.
Need to reproduce my biggest load with GM8. 2 bales in bed of truck + tractor(w/o tiller) and 2 bales on trailer. GM8 pulled it OK but took forever to get up to speed.
Only got one load of hay hauled today reading from that one is above. Hauled the tractor with front end loader up to my uncles to stack some there but got stuck behind someone that was creeping along and didn't take any readings. Then had fan blade go through radiator of tractor so I didn't get any more loads hauled.
Only have one tractor with loader. Load trailer with fork on back of one tractor unload at house with tractor and front end loader.
Once I can get all the hay moved and covered, I'll get the truck on the dyno. Looking at the computed torque reading from the scanner it could be interesting.